This puzzles me: I'm trying to connect through Remmina Remote Desktop Client to a X11vnc is a remote desktop server.

Both computers are running Linux, are online through a standard home DSL connection and have no fancy firewalls running.

Settings in Remmina:

When I connect the server laptop to the same dsl box as the client it connects without a problem. If I try to connect over the internet - after adjusting the I.P. number I get "Unable to Connect to VNC Server".

Did you configure port forwarding on your router? If you didn't, when you try to connect over the internet, the router dosen't know where to send the connection request.
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Scott GoodgameMay 29 '13 at 5:35

@ScottGoodgame Oh no, I hoped this would be easier. So I have to physically go to the location where the "server" is and configure port forwarding on the router? (model: Alice DSL Modem WLAN 1421?)
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somethisJun 3 '13 at 13:54